Coin cell batteries are commonly used in a variety of small electronic devices and products. These include medical devices like children's thermometers, as well as everyday items such as watches, calculators, toys, car key fobs, and flameless candles. They offer leakage resistance. Please dispose of used batteries responsibly and keep them out of reach of small children. Specifications: Capacity: 148mAh, Voltage: 3 Volt, System: Lithium battery, Button cell size: CR2025, Weight: 2 grams.